Airway feedback measurement system responsive to detected inspiration and obstructive apnea event

Abstract

An improved apparatus for and method of providing feedback to an implantable pulse generator to treat obstructive sleep apnea. Sensors monitor the electrical activity associated with contractions of the diaphragm. The pressure within the thorax and the upper airway are also measured. Whenever electrical activity of the diaphragm suggests that an inspiration cycle is in progress and the pressure sensors show an abnormal pressure differential across the airway, the presence of obstructive sleep apenea is assumed and electrical stimulation is applied to the musculature of the upper airway.

We claim: 
     
       1. An apparatus comprising: a. first means for detecting inspiration;   b. second means for detecting an obstructive apnea event; and,   c. means responsively coupled to said first detecting means and said second detecting means for generating a signal to stimulate muscles of an upper airway whenever said first detecting means detects inspiration and said second detecting means detects an obstructive apnea event.   
     
     
       2. An apparatus according to claim 1 wherein said generating means comprises an implantable pulse generator. 
     
     
       3. An apparatus according to claim 2 wherein said signal comprises a pulse train. 
     
     
       4. An apparatus according to claim 3 wherein said first detecting means further comprises an electrode for monitoring EMG. 
     
     
       5. An apparatus according to claim 4 wherein said second detecting means further comprises a pressure sensor.